70 AIRA ALPINA. 



apex jagged. Keel somewhat rough, having a brief rough awn 

 rising from a little above the centre, and extending to the apex 

 of the palea. Inner one rather shorter and membranous. Root 

 perennial and fibrous. Length from twelve to eighteen inches. 



Flowers at the commencement of August, and becomes ripe 

 in the middle of September. 



Dr. Parnell figures a viviparous variety called Vivipara. 



